Improvement in furnaces for evaporating



T. SPENCER.

Evaporating Pan.

Patented July 25, 1848.

fi Nkm NITED STATES THOMAS SPENCER, OF

ATENI Fr es.

SYRACUSE, NEYV YORK.

- IMPROVEMENT IN FURNACES FOR EVAPORATING.

To all whom, it may concern Be it known that I, THOMAS SPENCER, ofSyracuse, in the county of Onondaga and State of New York, have inventednew and useful Improvements in Furnaces for Evaporating Saline and otherLiquids; and I do hereby declare that the following is a full, clear,and exact description of the principle or character which distinguishesthem from all other things before known, and of the manner of making,constructing, and using the same, reference being had to theaccompanying drawings, making part of this specification, in whichFigure l is a longitudinal vertical section through the furnace on theline Z Z of Fig. 2, which is a plan with a portion of the pans and upperwork of the furnace removed. Fig. 3 is a vertical cross-section on theline X X of Fig. 2.

The same letters indicate like parts in all the figures.

The nature of my improvement consists in the formation of an arch overthe fire, and between it and the pans in the front part of the furnace,to protect them from the too intense action of the heat at that point.Said arch should be carried back far enough to protect all the frontkettles, say, forty feet, more or less, in long furnaces of about twohundred feet. One of the greatest annoyances heretofore experienced insalt-making has been the difficulty of protecting the front kettles orpans, in consequence of which they were constantlybreaking. In largefurnaces this breakage amounts to several thousand dollars per annum,besides the loss of time and material. By my improved plan ofconstruction I have not lost a pan in many months, thus proving,experimentally, the value of my improvement.

The construction is fully illustrated in the several figures of thedrawings, and is as follows: I build the foundation and sides of thefurnace and the chimney like those of an ordinary furnace for similarpurposes; but I prefer to extend the horizontal space for the kettlesmuch farther than has ordinarily been done, and at the entrance of thehorizontal line into the chimney I cause it to dive a little, which Iconsider advantageous. Over the firegrate a I turn an arch ofbrick-work, b, which I extend back under the kettles or pans c, for adistance of forty feet, more or less. In this arch, a little in front ofeach kettle, I form an oblong or other shaped opening, d, through whicha portion of the heat from the fire can pass to the kettles. These holesare graduated according to the distance from the fire. The arch thusserves as a shield against the direct action of the heat upon the pans,where it is most intense, and effects a great improvement in the salt orother crystallized substance manufactured. The smoke is more perfectlywith the pans when it first escapes, which very nmch conduccs to asaving of fuel.

hat I claim as myinvention, and desire to secure by Letters Patent, is-

The employment of an arch between the front kettles and the fire,constructed and arranged substantially in the manner and for the purposeset forth.

THOS. SPENCER.

\Vitnesses:

J. J. Gnnnnooen, A. P. BRowNE.

consumed by not coming directly in contact

